Extensible ladder



FIG. 1 is a front perspective view from above of the extensible ladder showing the present design;

FIG. 2 is a rear perspective view from below of the extensible ladder of FIG. 1;

FIG. 3 is a front view of the extensible ladder of FIG. 1;

FIG. 4 is a side view of the extensible ladder of FIG. 1; and,

FIG. 5 is a front view, in extended position, of the extensible ladder of FIG. 1. 

The ornamental design for an extensible ladder, as shown and described. 